Server "not yet reported" on WSUS

I have set up WSUS on a Windows 2003 Server machine that is not a Domain
Controller.

The problem I have is that I have 2 DC's in separate physical locations (one
in Adelaide and one in Darwin). The WSUS sits in Adelaide. The DC in
Adelaide seems to be updating to the WSUS just fine but the one in Darwin
does not. It reposrts its status as "not yet reported". I have installed
the latest WU client and run "wuauclt.exe /resetauthorization /detectnow"
with no luck. ALL machines including servers are set up in WSUS using Group
Policy with client-side targeting enabled. The two networks are separated
using frame relay on a managed WAN. They are on the same subnet but using a
different IP range - Adelaide is using 192.168.21.xxx and Darwin is using
192.168.22.xxx

I have attached a portion of the WU.log file from the Darwin server:

Triggering AU detection through DetectNow API
#############
## START ## AU: Search for updates
#########
<<## SUBMITTED ## AU: Search for updates [CallId =
{E33AC942-B847-4D3B-98EF-1DFA7ADC4510}]
*************
** START ** Agent: Finding updates [CallerId = AutomaticUpdates]
*********
WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80190193
WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80190193
WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80190193
WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80190193
WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80190193
WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80190193
WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80190193
WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80190193
WARNING: DownloadFileInternal failed for
http://flaapps02/selfupdate/wuident.cab: error 0x80190193
FATAL: IsUpdateRequired failed with error 0x80244018
WARNING: SelfUpdate: Default Service: IsUpdateRequired failed: 0x80244018
WARNING: SelfUpdate: Default Service: IsUpdateRequired failed, error =
0x80244018
* WARNING: Skipping scan, self-update check returned 0x80244018
* WARNING: Exit code = 0x80244018
*********
** END ** Agent: Finding updates [CallerId = AutomaticUpdates]
*************
WARNING: WU client failed Searching for update with error 0x80244018
>>## RESUMED ## AU: Search for updates [CallId = {E33AC942-B847-4D3B-98EF-1DFA7ADC4510}]
# WARNING: Search callback failed, result = 0x80244018
#########
## END ## AU: Search for updates [CallId =
{E33AC942-B847-4D3B-98EF-1DFA7ADC4510}]
#############
AU setting next detection timeout to 2007-01-22 09:45:35
REPORT EVENT: {CF820661-860F-42C2-95C5-90F917E323C4} 2007-01-22
14:15:35+0930 1 148 101 {D67661EB-2423-451D-BF5D-13199E37DF28} 0 80244018 SelfUpdate Failure Software
Synchronization Error: Agent failed detecting with reason: 0x80244018
Triggering AU detection through DetectNow API
#############
## START ## AU: Search for updates
#########
<<## SUBMITTED ## AU: Search for updates [CallId =
{D5A5AD77-196A-4DD5-A89C-ECC588B2EBDC}]
*************
** START ** Agent: Finding updates [CallerId = AutomaticUpdates]
*********
WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80190193
WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80190193
WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80190193
WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80190193
WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80190193
WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80190193
WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80190193
WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80190193
WARNING: DownloadFileInternal failed for
http://flaapps02/selfupdate/wuident.cab: error 0x80190193
FATAL: IsUpdateRequired failed with error 0x80244018
WARNING: SelfUpdate: Default Service: IsUpdateRequired failed: 0x80244018
WARNING: SelfUpdate: Default Service: IsUpdateRequired failed, error =
0x80244018
* WARNING: Skipping scan, self-update check returned 0x80244018
* WARNING: Exit code = 0x80244018
*********
** END ** Agent: Finding updates [CallerId = AutomaticUpdates]
*************
WARNING: WU client failed Searching for update with error 0x80244018
>>## RESUMED ## AU: Search for updates [CallId = {D5A5AD77-196A-4DD5-A89C-ECC588B2EBDC}]
# WARNING: Search callback failed, result = 0x80244018
#########
## END ## AU: Search for updates [CallId =
{D5A5AD77-196A-4DD5-A89C-ECC588B2EBDC}]
#############
AU setting next detection timeout to 2007-01-22 09:46:43
REPORT EVENT: {7DC24792-B5C0-44F8-8044-6B10EB519E25} 2007-01-22
14:16:43+0930 1 148 101 {D67661EB-2423-451D-BF5D-13199E37DF28} 0 80244018 SelfUpdate Failure Software
Synchronization Error: Agent failed detecting with reason: 0x80244018
Initializing simple targeting cookie, clientId =
731c1372-87ac-460b-8a53-357a7255821c, target group = Servers, DNS name =
fldfile001.freightlink.com.au
PT Server URL = http://flaapps02/SimpleAuthWebService/SimpleAuth.asmx
Report Uploading 2 events using cached cookie, reporting URL =
http://flaapps02/ReportingWebService...ebService.asmx
Report Reporter successfully uploaded 2 events.

I also have one laptop with the same problem.

Can anybody out there please help?

Thank you in advance.